JP4556808B2 - Vehicle alternator - Google Patents

Description

  The present invention relates to a vehicular AC generator mounted on a passenger car, a truck, etc., and more particularly to an improvement in the structure around the brush.

  Patent Document 1 proposes a structure in which a damping member interposed between the front end surface of the bearing box and the brush device is clamped in the axial direction.

5 proposes a seal structure in which a ring-shaped damping member 201 is sandwiched between the front end surface of the cover member 100 of the brush device and the rear end surface of the rear end wall 200 of the frame. ing.
JP-A-6-14500

  However, in the above-described seal structure of Patent Document 1, the force for causing the cover member of the brush device fixed to the rear end wall of the frame by fastening or the like to vibrate in the axial direction with respect to the rear end wall of the frame is Although it can be attenuated by the damping member, there has been a problem that it is not possible to sufficiently prevent the cover member from vibrating in the radial direction due to the radial vibration force acting on the cover member of the brush device. When the cover member of the brush device relatively vibrates in the radial direction with respect to the frame, the brush member is elastically supported in the radial direction with respect to the cover member by the slip ring provided on the rotating shaft supported by the frame and the spring member of the brush device. Due to vibration between the brushes, problems such as brushing and premature wear occur.

  Similar problems occur in the structure shown in FIG. In the structure shown in FIG. 5, when the vibration damping member 201 between the cover member 100 of the brush device and the rear end wall 200 of the frame is strongly tightened in the axial direction in order to reduce the radial vibration of the brush device, the brush device As a result, the cover member 100 is deformed, and various problems such as a decrease in sealing performance are caused.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide an automotive alternator that can satisfactorily reduce the vibration of the brush device while suppressing the complexity of the structure. .

  The present invention that solves the above-described problems includes a rotor having a slip ring for supplying a field current provided at a rear end portion of a rotating shaft, and a brush that is in sliding contact with the slip ring to hold the slip ring and the brush. A brush device having a cover member that covers the shaft, a bearing box that houses a bearing that rotatably supports the rotating shaft, a shaft hole portion through which the rotating shaft passes, and a front end surface of the cover member of the brush device. A frame having a rear end wall that supports the cover member and the bearing box while extending in a gap between the rear end surface of the bearing box, and a damping member disposed in close contact with the rear end wall of the frame; It is applied to an AC generator for vehicles comprising

In the present invention, in particular, the cover member has a protruding cylindrical portion that protrudes to the shaft hole portion of the rear end wall of the frame with a predetermined gap with respect to the outer peripheral surface of the rotating shaft, and the vibration damping member includes: A damping cylinder portion that fills a gap between the outer peripheral surface of the protruding cylindrical portion and the inner peripheral surface of the shaft hole portion of the frame, and a front end surface of the cover member and a rear end surface of the rear end wall of the frame It is characterized by comprising a rubber member having at least both rear-side damping wheel plate portions that fill the gaps therebetween. Further, in a state where there is no vibration force, the damping cylinder portion is compressed in the radial direction, and the damping wheel plate portion is compressed in the axial direction.

  That is, in the present invention, the cover member has a protruding cylindrical portion that protrudes into the shaft hole portion of the rear end wall of the frame. Furthermore, in addition to the gap between the front end surface of the cover member and the rear end wall of the frame, the damping member also fills the space between the protruding cylinder and the inner peripheral surface of the shaft hole portion of the rear end wall of the frame. Is done. Hereinafter, the portion of the damping member that fills the gap between the front end surface of the cover member and the rear end wall of the frame is referred to as a rear side damping wheel plate portion, and the inner peripheral surface of the shaft hole portion and the protruding cylinder portion The portion of the damping member that is filled between the outer peripheral surface is referred to as a damping cylinder portion.

Thus, even if the cover member is not strongly fastened to the rear end wall of the frame via the rear side damping wheel plate portion in the axial direction, the vibration energy of the cover member in the radial direction relative to the rear end wall of the frame is reduced. Can be attenuated better. As a result, it is possible to satisfactorily attenuate both the axial vibration and the radial vibration of the brush device with respect to the frame, and to prevent an undesirable deformation of the cover member of the brush device. In addition, since the damping cylinder portion is compressed in the radial direction and the damping wheel plate portion is compressed in the axial direction, it is possible to improve the damping effect in the radial direction and the axial direction of the cover member of the brush device.

  In a preferred aspect, the damping member includes a front end surface of the rear end wall of the frame and a bearing box from the front end of the damping cylindrical portion in addition to the rear damping wheel plate portion and the damping cylindrical portion. Or it has the front side damping ring-plate part extended in the clearance gap between bearings and filling this clearance gap.

  As a result, the axial vibration damping capability of the cover member of the brush device can be further improved, and the radial vibration damping capability can be improved to some extent. In addition, a thrust spring that parasitically displaces the bearing rearward can also be omitted. In the above-described present invention, it is obvious that the opposite of “front and back” is only a possible design matter.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention should not be construed as being limited to the following embodiments, and it is needless to say that the present invention can be implemented using other known techniques or techniques that share the necessary functions.

Example 1
(Overall structure)
FIG. 1 is a sectional view in the axial direction of the vehicle alternator of the first embodiment. Reference numeral 1 denotes a rotor (rotor), 2 a stator, 3 a front frame, 4 a rear frame, 5 a brush device, 6 a slip ring, 7 a resin cover, 8 a rectifier, and 9 a regulator. The stator 2 is formed by winding a stator coil 22 around a stator core 21 and is fixed to the inner peripheral surfaces of the front frame 3 and the rear frame 4. A front frame 3 and a rear frame 4 which are flange-shaped members manufactured by an aluminum die-cast method are fastened by surrounding the stator 2 with through bolts, and a rotating shaft 12 of the rotor 1 is supported rotatably through bearings 10 and 11. is doing. The rotor 1 is a Landel rotor having a field coil 13, and is fitted and fixed to the rotary shaft 12. The bearing 10 is fitted into a bearing box 14 formed on the front end wall 30 of the front frame 3, and the bearing 11 is fitted into an iron bearing box 15 fastened to the rear end wall 40 of the rear frame 4. The pair of slip rings 6 are provided at a rear end portion of the rotary shaft 12 at a predetermined interval, and are electrically connected to both ends of the field coil 13. The resin cover 7 surrounds the brush device 5, the rectifier 8, and the regulator 9 that are fastened to the outer surface of the rear end wall 40 of the rear frame 4. Since the structure and operation of the above-described vehicle alternator including the structure and operation of the rotor 1 are already well-known matters, further explanation will be omitted.

(Brush device 5)
The structure of the brush device 5 will be described in detail with reference to FIG.

  The brush device 5 is a resin molded product that is disposed in the radial direction and individually contacts the pair of slip rings 6 and holds the brushes 51 and 52 so as to be movable in the radial direction and covers the brush. The brush box 53, the springs 54 and 55 accommodated in the brush box 53 and elastically biasing the brushes 51 and 52 toward the pair of slip rings 6, and the pair of slip rings 6 fitted to the brush box 53 are substantially omitted. And a slip ring case 56 for sealing. Since the brush box 53 and the slip ring case 56 constitute a cover member referred to in the present invention, they will be collectively referred to as a cover member 100 hereinafter. A shaft hole is opened in the rear end wall 40 of the rear frame 4, and similarly, a shaft hole is also opened on the front end surface of the cover member 100 so as to face the shaft hole. The rear end portion of the rotating shaft 12 further protrudes rearward in the axial direction from the bearing 11, passes through the holes in the rear end wall 40 of the rear frame 4, and the shaft hole portion of the cover member 100 of the brush device 5. Has reached the inside. As shown in FIG. 2, the portion around the shaft hole portion of the rear end wall 40 of the rear frame 4 extends toward the gap between the bearing 11 and the cover member 100. A thrust washer 16 is supported on the front end surface of the rear end wall 40 of the rear frame 4 and elastically biases the outer ring of the bearing 11 forward.

(Seal and vibration control structure)
Particularly in this embodiment, the cover member 100 has a protruding cylinder portion 101 that protrudes into and penetrates the shaft hole portion of the rear end wall 40 of the rear frame 4 with a predetermined gap from the outer peripheral surface of the rotating shaft 12. is doing. The protruding cylinder portion 101 is made by resin molding integrally with the brush box 53 and the slip ring case 56 constituting the cover member 100.

  Furthermore, in this embodiment, a cylindrical gap between the outer peripheral surface of the protruding cylindrical portion 101 and the inner peripheral surface of the shaft hole portion of the rear end wall 40 of the frame 4, the front end surface of the cover member 100, and the rear frame 4 A flange-shaped damping member 102 that fills the annular plate-like gap between the rear end wall 40 and the rear end face is disposed in the gap.

  The vibration damping member 102 is made of a heat-resistant rubber member having excellent vibration damping properties, and the portion arranged in the cylindrical gap is called a vibration damping cylindrical portion, and the portion arranged in the ring plate-like gap is This is called the rear damping wheel plate. The damping cylinder is compressed in the radial direction, and the rear damping wheel plate is compressed in the axial direction. When assembling, for example, in a state in which the damping member 102 is fitted to the protruding cylindrical portion 101 of the cover member 100, the brush device 5 is pushed forward in the axial direction toward the rear end wall 40 of the rear frame 4, and thereafter Just conclude.

  According to the brush device damping structure of this embodiment using the damping member 102 described above, relative vibrations in the radial direction as well as the axial direction of the cover member 100 with respect to the rear end wall 40 of the rear frame 4 can be reduced. Thus, abnormal wear of the brushes 51 and 52 can be prevented. More specifically, the radial vibration force of the brush device 5 can be transmitted to the rear end wall 40 of the rear frame 4 through a short path through the cover member 100 and the vibration damping cylindrical portion of the vibration damping member 102 in order, and the cover member. The radial relative vibration between 100 and the rear end wall 40 of the rear frame 4 can be damped by the damping member 102. Further, the sealing effect for preventing the brush powder generated from the brushes 51 and 52 from scattering to the motor side can be improved, and the relative vibration between the rear end wall 40 of the rear frame 4 and the cover member 100 can be prevented. Further, since it is not necessary to strongly fasten the cover member 100 to the rear end wall 40 of the rear frame 4, distortion of the cover member 100 due to this fastening can be suppressed.

(Example 2)
Another embodiment will be described with reference to FIG.

  In this embodiment, the axial cross section of the damping member 102 is a U-shape as shown in FIG. 3 instead of the L-shape of the first embodiment.

  That is, the damping member 102 of this embodiment includes a ring extending radially outward from the front end of the damping cylinder 1021 in addition to the damping cylinder 1021 and the rear damping ring plate 1022 described above. This is characterized by having a plate-like front damping wheel plate portion 1023. The front damping wheel plate portion 1023 is embedded in a compressed state in a gap between the front end surface of the rear end wall 40 of the rear frame 4 and the rear end surface of the outer ring of the bearing 11 and the rear end surface of the bearing box.

  Thereby, the vibration damping capability in the axial direction or radial direction of the cover member 100 of the brush device 5 can be further improved, and the thrust washer 16 used in the first embodiment can be substituted by the front damping wheel plate portion 1023. Therefore, the axial vibration of the rotor can also be reduced.

  In assembling the damping member 102, it is preferable that the bearing box 15 is assembled after the damping member 102 is fitted into the shaft hole portion of the rear end wall 40 of the rear frame 4 from the front in advance. The axial thickness of the front damping wheel plate portion 1023 is preferably formed thicker than the rear damping wheel plate portion 1022 in order to secure an elastic force for substituting the thrust washer 16. .

(Example 3)
Another embodiment will be described with reference to FIG.

  In this embodiment, a cored bar 1024 is inserted into the front damping wheel plate portion 1023 of the damping member 102 having a U-shaped cross section shown in FIG. 3, and the rigidity of the damping member 102 can be enhanced. it can. Strong axial vibration of the rotor can be reduced. The core metal 1024 is preferably provided obliquely in the axial cross section, like the thrust washer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial sectional view of a vehicle AC generator according to a first embodiment. FIG. 2 is a partially enlarged axial direction sectional view showing the vicinity of the brush device of FIG. 1 in an enlarged manner. It is a partially expanded axial direction sectional view which expanded and illustrated the brush apparatus vicinity of Example 2. FIG. It is a partially expanded axial direction sectional view which expanded and illustrated the brush apparatus vicinity of Example 3. FIG. It is a partially expanded axial direction sectional view which expanded and illustrated the brush apparatus vicinity of the conventional alternator for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2 Stator 3 Front frame 4 Rear frame 5 Brush device 6 Slip ring 7 Resin cover 8 Rectifier 9 Regulator 10 Bearing 11 Bearing 12 Rotating shaft 13 Field coil 14 Bearing box 15 Bearing box 16 Thrust washer 21 Stator core 22 Stator coil 30 Front end Wall 40 Rear end wall 51 Brush 52 Brush 53 Brush box 54 Spring 55 Spring 56 Slip ring case 100 Cover member 101 Projecting cylinder portion 102 Damping member 1021 Damping cylinder portion 1022 Rear damping wheel plate portion 1023 Front damping wheel plate Part 1024 Core

Claims (2)

A rotor having a slip ring for supplying a field current provided at the rear end of the rotating shaft;
A brush device having a cover member that holds the brush in sliding contact with the slip ring and covers the slip ring and the brush;
A bearing box that houses a bearing that rotatably supports the rotating shaft;
A rear end that has a shaft hole portion through which the rotating shaft passes and extends to a gap between a front end surface of the cover member of the brush device and a rear end surface of the bearing box and supports the cover member and the bearing box. A frame having a wall;
A damping member disposed in close contact with the rear end wall of the frame;
In a vehicle alternator comprising:
The cover member is
A projecting cylindrical portion projecting into the shaft hole portion of the rear end wall of the frame with a predetermined gap with respect to the outer peripheral surface of the rotating shaft;
The damping member is
A damping cylinder portion that fills a gap between the outer peripheral surface of the protruding cylindrical portion and the inner peripheral surface of the shaft hole portion of the frame and is compressed in the radial direction , and the front end surface of the cover member and the rear of the frame An AC generator for a vehicle, comprising a rubber member that fills a gap between the end wall and the rear end face of the end wall and has at least both rear-side damping wheel plates compressed in the axial direction . In the vehicle alternator according to claim 1,
The damping member is
In addition to the rear side damping wheel plate part and the damping cylinder part, it extends from the front end of the damping cylinder part to a gap between the front end surface of the rear end wall of the frame and the bearing box or the bearing. An AC generator for a vehicle having a front damping wheel plate portion that fills the gap between the levers.

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